Photosynthesis "Dry Lab"

Materials

-Water

-5 Beakers

-Bromothymol Blue

-3 Elodea (Aquarium Plants)

-Aquarium

-Straws

-3 Snails

-Light Area

-Dark Area

Procedure

These tests are to be done at room temperature, using 50 pipette drops of Bromothymol Blue in 100 ml of water preferably done in a secure lab area.

Step 1: Fill a beaker with both water and Bromothymol Blue in the same beaker so that they may be combined. Observe the color and record your noticings.

Step 2: Get a different beaker and fill it with both water and Bromothymol Blue once again. However after add an aquarium snail to the mixture and observe the color after 3 hours of resting. (Record Observations)

Step 3: Fill another beaker once again with the same mixture of water and add Bromothymol Blue, then add Elodea. Once the Elodea has been added place this in a proper science testing area under light and observe the color after 3 hours of resting.

 Step 4: Fill the last 2 of the 5 beakers with water and Bromothymol Blue to each of them. Place an aquarium snail and an Elodea in both of the beakers. After adding the necessary aspects place one beaker in a lit area and the other in a dark area. Let them rest for 3 hours then observe the colors.

  

Results

Step 1 Results: Water combined with Bromothymol Blue results in a blue-green mixture of color due to the fact that the oxygen in the water that is being released turns the Bromothymol Blue a blue-green color. 

 
Step 2 Results: Water combined with Bromothymol Blue plus the addition of an aquarium snail turns the solution yellow. This is due to the fact that animals respire in the form of carbon dioxide, which in water becomes carbonic acid. Therefor this turns the solution yellow.

  

Step 3 Results. Water combined with bromothymol blue plus an elodea (aquarium plant) results in a blue-green solution in light because green plants photosynthesize in the light and respire constantly.

Step 4 Results:
In light: Water combined with Bromothymol Blue with the addition of a snail and elodea results in a blue-green color in light because the plant photosynthesizes.

In dark: Water combined with Bromothymol Blue plus a snail and elodea results in a yellow solution in the dark because there is no light therefor the plant has no light for photosynthesis.